US20080088061A1 - Cooling Circuit for a Preform Oven and Method of Implementing One Such Circuit - Google Patents

Cooling Circuit for a Preform Oven and Method of Implementing One Such Circuit Download PDF

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Publication number
US20080088061A1
US20080088061A1 US11/628,501 US62850105A US2008088061A1 US 20080088061 A1 US20080088061 A1 US 20080088061A1 US 62850105 A US62850105 A US 62850105A US 2008088061 A1 US2008088061 A1 US 2008088061A1
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Prior art keywords
coolant fluid
cooling
temperature
fluid
recirculation loop
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Abandoned
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US11/628,501
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English (en)
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Patrick Mie
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Sidel Participations SAS
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Individual
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Assigned to SIDEL PARTICIPATIONS reassignment SIDEL PARTICIPATIONS ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MIE, PATRICK
Publication of US20080088061A1 publication Critical patent/US20080088061A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/68—Ovens specially adapted for heating preforms or parisons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/006—Blow-moulding plants, e.g. using several blow-moulding apparatuses cooperating
    • B29C49/0062—Blow-moulding plants, e.g. using several blow-moulding apparatuses cooperating using two or more parallel stations, e.g. two parallel heating or blowing stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/0208—Combined blow-moulding and manufacture of the preform or the parison joining several separate preforms while blow-moulding, e.g. two cylindrical preforms welded together during blowing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/6409—Thermal conditioning of preforms
    • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
    • B29C49/6445—Thermal conditioning of preforms characterised by temperature differential through the preform length
    • B29C49/645—Thermal conditioning of preforms characterised by temperature differential through the preform length by cooling the neck
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/68—Ovens specially adapted for heating preforms or parisons
    • B29C49/682—Ovens specially adapted for heating preforms or parisons characterised by the path, e.g. sinusoidal path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/64—Heating or cooling preforms, parisons or blown articles
    • B29C49/68—Ovens specially adapted for heating preforms or parisons
    • B29C49/6855—Cooling of heating means, e.g. avoiding overheating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles

Definitions

  • the invention relates to a cooling circuit for a tunnel for heating preforms.
  • the invention relates to a cooling circuit for a tunnel for heating preforms of the type comprising a parallel first and second cooling rail, inside which rails a coolant fluid circulates and which rails border a longitudinal opening of the heating tunnel, along which the preforms are displaced, of the type comprising a common inlet pipe which is supplied with cold coolant fluid and is connected in parallel to an upstream end of each cooling rail, and comprising a common outlet pipe for the hot coolant fluid which is connected in parallel to the downstream end of each cooling rail, of the type comprising a valve for replacement of the coolant fluid which is connected in one of the common inlet or outlet pipes, the cooling circuit comprising means for measuring the temperature of the coolant fluid, of the type comprising a bypass, the upstream end of which is connected to the common outlet pipe and the downstream end of which is connected to the common inlet pipe so as to form a closed loop for recirculation of the coolant fluid in the cooling rails when the replacement valve is closed, and of the type in which the recirculation loop
  • thermoplastic material for example of polyethylene terephthalate (PET)
  • PET polyethylene terephthalate
  • the manufacture of receptacles, and in particular of bottles, made of thermoplastic material, for example of polyethylene terephthalate (PET) is generally carried out starting from previously injection-moulded preforms which are shaped into bottles by an operation of blowing or drawing and blowing of their body and their bottom.
  • the preforms generally have the shape of a test tube, the neck of which already has the final shape of the neck of the bottle.
  • the neck comprises a thread intended to receive a screw cap, for example.
  • heating furnaces for preforms of the type which comprises a longitudinal heating tunnel are already known.
  • the cold preform with vertical axis is transported by a transport device from a first end of the tunnel, and then it moves along the tunnel in which the first part of the preform, comprising the body and the bottom, is heated before coming out via the second end of the tunnel.
  • the preform thus reheated is ready for the blowing operation.
  • the heating furnace may comprise one or more heating modules or units which each comprise a tunnel portion and are aligned following one another so as to form a single tunnel of great length.
  • heating module will be assimilated into the term furnace.
  • one tunnel wall is equipped with radiation heating means while the other wall is provided with ventilation openings to allow the passage of blown air in order to promote homogeneous heating throughout the thickness of the cylindrical wall of the body of the preform.
  • the blown air makes it possible to remove the convection heat caused by the heating means in order to promote penetration of the radiation to which they give rise into the thickness of the thermoplastic material constituting the body.
  • the preforms are generally set in rotation about themselves during their movement in the furnace.
  • the neck of the preform which is shaped to its final shape and dimensions during manufacture, generally by injection-moulding of the preform, must not be deformed during the heating and/or blowing operations. It is therefore essential to keep the neck at a temperature lower than the vitreous transition temperature or softening temperature.
  • the neck of the preform is kept outside the tunnel through an opening of the tunnel which forms a longitudinal passage channel.
  • the preforms are arranged neck down during at least part of their heating. This makes it possible to prevent or to limit reheating of the neck by ascending convection movements of the hot air.
  • a cold coolant fluid circulates inside the cooling rails in order to protect the neck of the preforms effectively from the heat of the heating tunnel.
  • the cooling rails are thus connected in a cooling circuit.
  • the cold coolant fluid supply is controlled by means of a valve for replacement of the fluid.
  • the fluid replacement valve is opened so as to fill the cooling rails with cold coolant fluid.
  • a probe for measuring the temperature makes it possible to monitor the temperature of the coolant fluid contained in the cooling rails at a point of the cooling circuit.
  • the fluid replacement valve is opened and the hot coolant fluid is replaced with cold coolant fluid.
  • the heating means are likely to heat the coolant fluid more rapidly in certain sections of the heating tunnel. This is because, as a function of various parameters such as the final shape of the bottles or the shape of the preforms, the heating means are capable of being regulated to heat the preforms differently according to their position in the tunnel.
  • the coolant fluid is thus not heated in a homogeneous manner in the cooling rails.
  • the temperature measured at a single point of the cooling circuit is therefore not always representative of the local heating of the coolant fluid at some points of the cooling circuit. In these local points, the cooling rails are likely no longer to protect the neck of the preforms effectively from the heat.
  • the invention proposes a cooling circuit of the type described above, characterized in that the regulating means comprise means for measuring the flow of the coolant fluid which are connected in the recirculation loop, and the regulating means control the opening of the replacement valve as a function of the measured flow of coolant fluid in the recirculation loop.
  • the invention also proposes a method for implementing the means for regulating the temperature of the cooling circuit, characterized in that it comprises the following steps:
  • FIG. 1 is a cross-sectional view which shows a heating tunnel inside which the body of a preform is heated, the neck of the preform being kept below the tunnel so as to be protected from the heat by two lateral cooling rails which are supplied with coolant fluid by a cooling circuit;
  • FIG. 2 is a view from above which shows diagrammatically the cooling circuit of the heating tunnel in FIG. 1 which is made according to the invention
  • FIG. 3 is a block diagram which shows a method for implementing the cooling circuit in FIG. 2 ;
  • FIG. 4 is a block diagram which shows a variant of the method in FIG. 3 .
  • a flow direction oriented from upstream to downstream will be adopted for the fluids.
  • a receptacle preform 10 obtained by injection-moulding for example, which has an essentially cylindrical body of revolution 12 with a vertical axis A with a thick wall, has been illustrated in FIG. 1 .
  • a first end, here the upper end, of the preform 10 is closed by a hemispherical bottom 14 with a thick wall.
  • the other end, here the lower end, comprises a neck 16 shaped to its final shape and dimensions.
  • the preliminary heating step consists in heating the body 12 and the bottom 14 of the preform 10 , excluding the neck 16 , to a temperature higher than the vitreous transition temperature T of the constituent thermoplastic material of the preform 10 .
  • the heating is carried out by making the preforms 10 pass through a horizontally oriented heating tunnel 18 comprising at least one vertical lateral heating wall 20 which comprises heating means.
  • the heating tunnel 18 comprises two parallel longitudinal portions 18 A, 18 B.
  • the preforms 10 pass successively through the first portion 18 A from a proximal inlet end 19 of the tunnel 18 towards a distal end, and then, after a 180° turn, they pass through the second portion 18 B in the opposite direction from the distal end towards the proximal outlet end 21 of the tunnel 18 , so that the proximal outlet end 21 of the heating tunnel 18 is close to the proximal inlet 19 of the heating tunnel 18 .
  • the invention can also be applied to heating tunnels of different shape, for example longitudinal rectilinear tunnels or semi-circular tunnels.
  • the walls of the heating tunnel are shown as broken lines.
  • the heating wall 20 is arranged on the “external” side of the furnace, visible in this figure to the left of the preforms 10 in relation to their displacement direction indicated by the arrows F.
  • the heating means here comprise seven longitudinal heating tubes 22 which are mounted one above another on the heating wall 20 .
  • the heating tubes 22 are lamps which emit infra-red rays of a wavelength suitable for heating by radiation the constituent thermoplastic material of the preforms 10 .
  • the heating tubes 22 are preferably mounted so that it is possible to regulate independently the transverse distance of each heating tube 22 in relation to the preforms 10 moving in the tunnel 18 .
  • the heating tunnel 18 is divided into a number of sections in which the heating means are regulated so as to heat to a greater or lesser extent different parts of the body 12 and of the bottom 14 of the preforms 10 in the course of a single pass through the heating tunnel 18 .
  • a first “penetration” section or zone in which the heating tubes 22 are regulated so as to heat the whole of the body 12 and of the bottom 14 of the preforms 10 to a temperature close to its final value, and a second “profile heating” section or zone in which the tubes 22 are regulated independently so as to heat more specifically certain parts of the body 12 or of the bottom 14 of the preforms 10 as a function of the final shape to be given to the receptacles produced from the preforms 10 during the steps following the heating step.
  • the penetration zone can correspond to the first longitudinal portion 18 A of the heating tunnel
  • the “profile heating” zone can correspond to the second longitudinal portion 18 B of the heating tunnel.
  • the preforms 10 are simultaneously set in rotation about their axis A as indicated by the arrow 24 .
  • a reflecting panel 26 can preferably be arranged on an opposite vertical lateral wall 28 of the heating tunnel 18 facing the heating tubes 22 to reflect towards the bodies 12 of the preforms 10 the fraction of the heating radiation passing between two successive preforms 10 .
  • the opposite lateral wall 28 will therefore be referred to as the reflecting wall 28 in the rest of the description.
  • the heating tunnel 18 comprises a lower longitudinal opening 30 which is delimited laterally by the longitudinal lower edges of the reflecting wall 28 .
  • the neck 16 is thus kept outside the heating tunnel 18 , below the opening 30 , while the body 12 and the bottom 14 of the preform 10 are heated in the heating tunnel 18 .
  • the longitudinal opening 30 is located below the heating tunnel 18 , but the invention can also be applied to heating tunnels provided with an upper opening. In the latter configuration, the preforms 10 then pass through vertically, the neck 16 being directed upwards.
  • the invention can also be applied to heating tunnels of the “endless chain” type (not shown) which comprise a part in which the preforms 10 are reheated neck 16 up and another part in which the preforms 10 are reheated neck 16 down.
  • Each cooling rail 32 , 34 is arranged below the heating wall 20 and the reflecting wall 28 so as to border the longitudinal opening 30 .
  • Each cooling rail 32 , 34 extends transversely as far as the neck 16 of the preforms 10 but without touching them so as to make the lower longitudinal opening 30 more narrow.
  • the cooling rails 32 , 34 have the function in particular of thermally protecting the neck 16 from the heat which prevails in the heating tunnel 18 .
  • one or more opening longitudinal cooling pipes 36 , 38 A, 38 B are formed inside the cooling rails 32 , 34 so that a cold coolant fluid can circulate in the cooling rails 32 , 34 to cool them.
  • the coolant fluid is glycol diluted in water for example.
  • the cooling rails 32 , 34 are made of aluminium, for example, so that the heat produced in the heating tunnel 18 is communicated by conduction to the coolant fluid contained in the cooling pipes 36 , 38 A, 38 B.
  • the cooling rails 32 , 34 are connected to a cooling circuit 40 .
  • the cooling circuit 40 of the heating tunnel 18 has been illustrated diagrammatically in FIG. 2 .
  • the first, external cooling rail 32 which is located below the heating wall 20 , comprises a single cooling pipe 36 here.
  • the second, internal cooling rail 34 which is located below the reflecting wall 28 , comprises two cooling pipes 38 A, 38 B here.
  • first, external cooling rail 32 has to absorb a greater quantity of heat than the second, external cooling rail 34 as it is arranged facing the heating tubes 22 .
  • the cooling circuit 40 comprises a common inlet pipe 42 , the downstream end 44 of which comprises branches 46 so as to supply in parallel with coolant fluid the upstream end 48 , 50 of each cooling rail 32 , 34 .
  • a common coolant fluid outlet pipe 52 is connected to the downstream end 54 , 56 of each cooling rail 32 , 34 so as to remove the coolant fluid which has become hot.
  • the cooling circuit 40 also comprises a valve 58 for replacement of the coolant fluid, which is connected in the common outlet pipe 52 .
  • this is a solenoid valve.
  • the replacement valve 58 is connected in the common inlet pipe 42 .
  • the external cooling rail 32 is divided into two, upstream and downstream, longitudinal sections, which are indicated by references 32 A and 32 B respectively.
  • Each longitudinal section, upstream 32 A and downstream 32 B, is arranged on the respective first portion 18 A and 18 B of the heating tunnel 18 .
  • the internal cooling rail 34 is divided into two, upstream and downstream, longitudinal sections, which are indicated by references 34 A, 34 B respectively.
  • the cooling circuit 40 comprises a bypass 60 , an upstream end 62 of which is connected to the common outlet pipe 52 , upstream of the replacement valve 58 , and the downstream end 64 of which is connected to the common inlet pipe 42 .
  • the cooling circuit 40 thus comprises a closed recirculation loop 66 for the coolant fluid.
  • the recirculation loop 66 comprises the bypass 60 , the section of the common inlet pipe 42 between the downstream end 64 of the bypass 60 and the upstream ends 48 , 50 of the cooling rails 32 , 34 , the cooling rails 32 , 34 , and the section of the common outlet pipe 52 between the downstream ends 54 , 56 of the cooling rails 32 , 34 and the upstream end 62 of the bypass 60 .
  • a fluid pump 68 is connected in the recirculation loop 66 in order to set the coolant fluid in motion, so that it circulates in clockwise direction in the recirculation loop 66 looking at FIG. 2 when the replacement valve 58 is closed.
  • the fluid pump 68 is connected in the common outlet pipe 52 , upstream of the upstream end 62 of the bypass 60 .
  • a first non-return valve 70 is connected in the bypass 60 in order to prevent the fluid from turning in the opposite direction, that is to say the anti-clockwise direction, in the recirculation loop 66 .
  • a second non-return valve 72 is connected in the common inlet pipe 42 , upstream of the downstream end 64 of the bypass 60 , in order to prevent the coolant fluid from being forced back in the opposite direction towards the upstream end of the common inlet pipe 42 .
  • connection pipes of the upstream sections 32 A, 34 A and the downstream sections 32 B, 34 B of the cooling rails 32 , 34 are transposed.
  • the downstream end 74 of the upstream section 32 A, 34 A of each cooling rail 32 , 34 is connected to the upstream end 76 of the downstream section of the other cooling rail 34 , 32 .
  • cooling rails 32 , 34 it is possible to divide the cooling rails 32 , 34 into more than two sections and to transpose the connections between two successive sections in the same way in order to improve further the homogenization of the temperature of the coolant fluid.
  • the cooling circuit 40 also comprises automatic means for regulating the temperature of the coolant fluid.
  • these regulating means comprise means 78 for measuring the temperature of the coolant fluid, such as a probe, at a point of the recirculation loop 66 .
  • the probe is arranged in the common outlet pipe 52 .
  • the regulating means also comprise an electronic control unit (not shown) which is connected electrically to the means 78 for measuring the temperature, to the fluid pump 68 and to the replacement valve 58 .
  • the means for regulating the temperature are implemented according to a method for regulating the temperature which will be described below.
  • the method for regulating the temperature of the coolant fluid comprises mainly four steps.
  • the fluid replacement valve 58 is closed, or remains in closed position if it was already closed, and the fluid pump 68 is activated in order to make the coolant fluid circulate in the recirculation loop 66 .
  • the coolant fluid flows into the common inlet pipe 42 in the direction of the upstream end 48 , 50 of the cooling rails 32 , 34 .
  • the coolant fluid is then distributed into each of the cooling rails 32 , 34 , and then it is removed in the common outlet pipe 52 .
  • the replacement valve 58 is closed, the coolant fluid uses the bypass 60 to return to the starting point.
  • the temperature of the coolant fluid is measured in the recirculation loop 66 by means 78 for measuring the temperature.
  • the measured temperature Tm is then compared with an upper temperature threshold Tsup above which it is considered that the neck 16 of the preform 10 is no longer protected effectively by the cooling rails 32 , 34 .
  • the temperature Tm measured by the means 78 for measuring the temperature at a point of the recirculation loop 66 is essentially representative of the temperature of the coolant fluid at any point of the recirculation loop 66 .
  • the coolant fluid leaving the internal cooling rail 34 and the coolant fluid leaving the external cooling rail 32 to flow into the common outlet pipe 52 are overall at the same temperature. Furthermore, the mixing of the fluids in the common pipes allows total homogenization of the temperature.
  • a third step E 3 of replacement of the coolant fluid, is initiated.
  • the valve 58 for replacement of the coolant fluid is then opened in order to make a portion of the hot coolant fluid leave the recirculation loop 66 via the common outlet pipe 52 and to replace it with cold coolant fluid entering the recirculation loop 66 by means of the common inlet pipe 42 .
  • the lower temperature threshold Tinf corresponds to a temperature below which air is capable of condensing on the cooling rails 32 , 34 and of forming water droplets which are detrimental to the heating of the preform 10 .
  • the method is then repeated starting from the second step E 2 .
  • the cooling circuit 40 preferably also comprises means 80 for measuring the flow of the coolant fluid, which are connected electrically to the electronic control unit.
  • these means are a flow meter 80 . It is thus possible to locate any malfunctioning of the fluid pump 68 .
  • the means for regulating the temperature are then capable of being controlled according to a reduced mode of the method described above, as illustrated in FIG. 4 .
  • the second step E 2 of temperature control, comprises an additional operation of measuring the flow of the coolant fluid by flow measurement means 80 .
  • the lower Tinf and upper Tsup temperature thresholds are then modified as a function of the measured flow Dm.
  • the lower Tinf and upper Tsup temperature thresholds have a “normal” value Tinf_nom, Tsup_nom when the measured flow Dm is higher than a lower flow threshold Dinf, that is to say when the fluid pump 68 is functional.
  • the temperature Tm measured by the temperature measurement means 78 is then no longer representative of the temperature of the coolant fluid at any point of the recirculation loop 66 . It is therefore necessary to replace the coolant fluid more frequently to prevent it overheating at a point of the recirculation loop 66 , in particular in certain zones such as the penetration zone or the “profile heating” zone.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Tunnel Furnaces (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
US11/628,501 2004-06-15 2005-06-08 Cooling Circuit for a Preform Oven and Method of Implementing One Such Circuit Abandoned US20080088061A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0451178A FR2871403B1 (fr) 2004-06-15 2004-06-15 Circuit de refroidissement perfectionne pour un four a preformes et procede de mise en oeuvre d'un tel circuit
FR0451178 2004-06-15
PCT/EP2005/052637 WO2005123367A1 (fr) 2004-06-15 2005-06-08 Circuit de refroidissement perfectionné pour un four à préformes et procédé de mise en oeuvre d'un tel circuit

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US20080088061A1 true US20080088061A1 (en) 2008-04-17

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US11/628,501 Abandoned US20080088061A1 (en) 2004-06-15 2005-06-08 Cooling Circuit for a Preform Oven and Method of Implementing One Such Circuit

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US (1) US20080088061A1 (es)
EP (1) EP1768832B1 (es)
AT (1) ATE448933T1 (es)
DE (1) DE602005017783D1 (es)
ES (1) ES2333446T3 (es)
FR (1) FR2871403B1 (es)
PT (1) PT1768832E (es)
WO (1) WO2005123367A1 (es)

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CN112848226A (zh) * 2020-12-28 2021-05-28 广州紫江包装有限公司 一种塑料瓶坯制作辅助用加速冷却的设备
CN114770889A (zh) * 2022-02-28 2022-07-22 海天塑机集团有限公司 一种用于注塑机在监测过程中的监测数据获取系统与方法

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FR2878185B1 (fr) 2004-11-22 2008-11-07 Sidel Sas Procede de fabrication de recipients comprenant une etape de chauffe au moyen d'un faisceau de rayonnement electromagnetique coherent
US10857722B2 (en) 2004-12-03 2020-12-08 Pressco Ip Llc Method and system for laser-based, wavelength specific infrared irradiation treatment
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EP1768832A1 (fr) 2007-04-04
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WO2005123367A1 (fr) 2005-12-29
PT1768832E (pt) 2009-11-30
ES2333446T3 (es) 2010-02-22
ATE448933T1 (de) 2009-12-15
EP1768832B1 (fr) 2009-11-18

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